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Chapter 19: Wireless Wide-Area Networking
Connecting to the Internet
Psion Mobile Devices Developers Guide
206
19.7 Connecting to the Internet
A WWAN modem must initiate a connection. This behaviour is similar to a dial-up connection but different
from an Ethernet interface which connects automatically. When a WWAN modem is attached to a network
and powered up, it detects the network, but is unable to transfer packets to the network until a packet data
connection is set up.
Figure 19.1 Interaction Between Mobile Devices SDK WWAN And Windows Components
The WWAN functions in the Mobile Devices SDK provide extra features that are needed by a WWAN connec-
tion, but not by an Ethernet or dial-up connection. These features include the ability to:
Query the radio signal strength
Select one of several available networks
The Wireless Manager applet in the GUI allows you to configure settings for the WWAN connection. This
gives access to many of the WWAN driver functions, without the necessity of writing code. This includes
activities such as querying the signal strength. The Wireless Manager applet uses RAS to connect and
disconnect WWAN connections.
19.7.1 Windows Embedded CE 5.0, Windows Embedded CE 6.0, Windows Mobile 2003 SE,
and Windows CE .NET 4.2
The following provide the RAS (Remote Access Service) API for making Internet connections.
Windows Embedded CE 5.0
Windows Embedded CE 6.0
An application can use the Windows RAS API to set up and tear down a WWAN connection.
NDIS
WWAN NDIS-WAN
Miniport driver
Virtual serial port
Serial driver
WWAN modem
PPP
IP
TCP/UDP
Winsock API
Packets
RAS
RAS API
NdisUio2
WWAN API
WWAN Control Panel
user interface
NDIS
WWAN NDIS-WAN
Miniport driver
Virtual serial port
Serial driver
WWAN modem
PPP
IP
TCP/UDP
Winsock API
Packets
Application using Mobile Devices SDK
RAS
RAS API
NdisUio2
WWAN API
WWAN Control Panel
user interface
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